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xinji

铜虫 (小有名气)

[求助] 在gromacs中运行mdrun命令时出错

在gromacs中,运行mdrun时,出现以下错误提示:
50000 steps,     50.0 ps.
step 0
t = 0.001 ps: Water molecule starting at atom 22288 can not be settled.
Check for bad contacts and/or reduce the timestep.
Back Off! I just backed up step1b.pdb to ./#step1b.pdb.3#
Back Off! I just backed up step1c.pdb to ./#step1c.pdb.3#
Wrote pdb files with previous and current coordinates
t = 0.002 ps: Water molecule starting at atom 22288 can not be settled.
Check for bad contacts and/or reduce the timestep.
Back Off! I just backed up step2b.pdb to ./#step2b.pdb.1#
Back Off! I just backed up step2c.pdb to ./#step2c.pdb.1#
Wrote pdb files with previous and current coordinates
Warning: 1-4 interaction between 8908 and 8916 at distance 1100.091 which is larger than the 1-4 table size 2.400 nm
These are ignored for the rest of the simulation
This usually means your system is exploding,
if not, you should increase table-extension in your mdp file
or with user tables increase the table size
Segmentation fault
请问各位,是什么原因呢???
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xinji

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感谢各位,
心若在,梦就在!
7楼2012-01-03 16:36:58
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0419xuhao

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【答案】应助回帖

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御剑江湖(金币+2): 谢谢 2011-12-21 18:48:15
结构建的不合理,或者能量最小化没有正常结束,你试试看
2楼2011-12-21 11:14:02
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草莓米粑

金虫 (小有名气)

【答案】应助回帖

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jiaoyixiong(金币+5): 鼓励交流 2011-12-22 15:04:57
我也遇到过同样的问题,可能是模型当中有分子之间距离过近或者产生重叠,运行时,粒子一下子被弹开了,就导致体系崩溃了。
3楼2011-12-22 09:21:21
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jiaoyixiong

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【答案】应助回帖

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御剑江湖(金币+4): 谢谢 2011-12-22 21:29:08
xinji(金币+8): ★★★很有帮助 2011-12-22 22:38:52
Segmentation fault的常见原因是体系构建不合理,建议先多跑跑energy minimization

如果使用steep 方法进行能量最小化之后,还是出现这样的问题,
需要接着使用CG方法继续能量最小化

然后再进行后续的平衡态模拟

还有一种解决办法是,在此步使用grompp 的时候,把上一步得到的能量文件(edr) 引入,这样就可使能量有连续性。
4楼2011-12-22 15:06:11
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